Differential top-antitop cross-section measurements as a function of observables constructed from final-state particles using pp collisions at √ s = 7 TeV in the ATLAS detector

Allbrooke, B M M, Asquith, L, Cerri, A, Chavez Barajas, C A, De Santo, A, Potter, C T, Salvatore, F, Santoyo Castillo, I, Suruliz, K, Sutton, M R, Vivarelli, I and others (ATLAS collaboration), (2015) Differential top-antitop cross-section measurements as a function of observables constructed from final-state particles using pp collisions at √ s = 7 TeV in the ATLAS detector. Journal of High Energy Physics. ISSN 1029-8479

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Abstract

Various differential cross-sections are measured in top-quark pair (t ¯ t) events produced in proton-proton collisions at a centre-of-mass energy of √ s = 7TeV at the LHC with the ATLAS detector. These differential cross-sections are presented in a data set corresponding to an integrated luminosity of 4.6fb −1. The differential cross-sections are presented in terms of kinematic variables, such as momentum, rapidity and invariant mass, of a top-quark proxy referred to as the pseudo-top-quark as well as the pseudo-top-quark pair system. The dependence of the measurement on theoretical models is minimal.
The measurements are performed on t ¯ t events in the lepton+jets channel, requiring exactly one charged lepton and at least four jets with at least two of them tagged as originating from a b-quark. The hadronic and leptonic pseudo-top-quarks are defined via the leptonic or hadronic decay mode of the W boson produced by the top-quark decay in events with a single charged lepton. Differential cross-section measurements of the pseudo-top-quark variables are compared with several Monte Carlo models that implement next-to-leading order or leading-order multi-leg matrix-element calculations.

Item Type: Article
Keywords: Hadron-Hadron Scattering, Top physics
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Richard Chambers
Date Deposited: 20 Jul 2015 14:03
Last Modified: 07 Mar 2017 11:46
URI: http://sro.sussex.ac.uk/id/eprint/55640

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